Anxiety Disorder diagnosis

This useless diagnosis is apparently a catch all for nothing dx. It’s limited to being dx for 6 months after the stressor my sTBi was over ten years ago. How can you say I have an AD with my sTBI. If my residuals are still manifested is that still technically an ongoing stressor for my AD? Does anyone have any experience with this I know I’ve already been dx for having PTSD and a sTBI, how is that possible to have a AD with those two already service connected? Makes my damn head shake pardon my French…